A disconnecting switch overhauling device and method

Abstract

The application is suitable for the technical field of switch maintenance, and provides an isolating switch maintenance device and method, which comprises a multi-modal sensing unit, the multi-modal sensing unit is arranged on a knife switch of the isolating switch, and is used for detecting various parameters of the isolating switch, the detected parameters include contact temperature, contact straightness and environmental temperature signals; a temperature control contact, the temperature control contact is arranged on the knife switch, and the temperature control contact changes the pressure on the knife switch correspondingly with the change of temperature; and a control module, which collects parameters of the multi-modal sensing unit and the temperature control contact, and processes the collected parameters, thereby, the application sets a device for automatically maintaining the isolating switch, detects various parameters on the isolating switch, effectively realizes the judgment on the state of the isolating switch, and feeds back the state of the isolating switch to corresponding personnel, thereby assisting personnel in positioning and maintaining the fault of the isolating switch.

Description

Technical Field

[0001] This invention relates to the field of switch maintenance technology, and in particular to a device and method for maintaining disconnecting switches. Background Technology

[0002] According to the State Grid's requirement for intelligent substation construction with "one-click sequential control," primary equipment such as disconnect switches needs to provide reliable auxiliary signals as a secondary criterion for the main control logic. Specifically, by detecting signals such as pressure and temperature between conductive contacts and fingers, the current operating condition of the switch can be directly reflected, providing reliable logic signals to the backend.

[0003] During long-term outdoor operation, high-voltage disconnect switches may experience changes in the clamping force between the conductive contacts and fingers due to factors such as the external natural environment and their own design structure. Insufficient clamping force can lead to reduced current flow and increased temperature at the conductive contact surface, and in severe cases, arcing and ablation of the conductive material can occur, potentially causing power grid safety accidents.

[0004] Traditional disconnector maintenance methods mostly rely on manual judgment, using manual observation and inspection to regularly maintain the disconnector's function. However, this method increases the cost of manual inspection, and due to the limitations of human inspection, it is easy to miss some cases, affecting the stability and timeliness of disconnector maintenance.

[0005] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the Invention

[0006] To address the aforementioned deficiencies, the present invention aims to provide a method for the maintenance of disconnecting switches. This method utilizes a device that automatically maintains the disconnecting switch by detecting various parameters on the switch, thereby effectively determining its status and providing feedback to the relevant personnel to assist in locating and repairing faults in the disconnecting switch.

[0007] To achieve the above objectives, the present invention provides a disconnector switch maintenance device, comprising: A multimodal sensing unit is arranged on the disconnector switch to detect various parameters of the disconnector switch, including contact temperature, contact straightness and ambient temperature signal. A temperature control contact is disposed on the knife switch, and the pressure exerted by the temperature control contact on the knife switch changes accordingly with the temperature change; The control module collects parameters from the multimodal sensing unit and temperature contacts, processes the collected parameters, determines the status of the corresponding disconnect switch, and feeds back the results to maintenance personnel.

[0008] In one embodiment, the knife switch includes a first knife switch and a second knife switch, the temperature control contact is disposed on the second knife switch, and the first knife switch is inserted inside the second knife switch so that the temperature control contact and the first knife switch fit together to form a closed circuit.

[0009] In one embodiment, the second knife switch is provided with a fitting sleeve, and the temperature control contact is installed inside the fitting sleeve. The inner wall of the fitting sleeve is provided with a plurality of mounting holes, and the temperature control contact is slidably connected to the inside of the mounting holes.

[0010] In one embodiment, the temperature control contact includes: The contact body is slidably connected to the interior of the mounting hole, and a limiting flange is provided on the top of the contact body; A thrust spring is disposed on the top of the contact body to press the contact body against the bottom of the mounting hole, and a thermally expanding liquid is filled between the top of the contact body and the mounting hole.

[0011] In one embodiment, the first and second disconnect switches are provided with straightness measuring heads, which detect the straightness of the first and second disconnect switches after they are connected.

[0012] In one embodiment, the disconnect switch includes a main frame, with two insulators on the top of the main frame and conductive bases on the top of the insulators that cooperate with the knife switch. The first knife switch and the second knife switch are respectively connected to the corresponding conductive bases.

[0013] The present invention also provides a maintenance method, comprising the following steps: S1. The contact temperature Temp and ambient temperature T_emp parameters are synchronously collected by the multimodal sensing unit deployed on the disconnecting switch; S2. The collected multidimensional parameters are transmitted to the control module for data processing, and then the processed data is compared and analyzed. S3. Based on the processed data and comparison, output the risk level of the disconnect switch and the handling method; S4. Based on the risk level and handling method of the disconnecting switch, automatically match the maintenance strategy and generate the maintenance strategy for the disconnecting switch; S5. Operators carry out maintenance according to the maintenance strategy. After the maintenance is completed, the maintenance effect is retested and closed-loop verification is performed through the multimodal sensing unit.

[0014] In one embodiment, in step S2, data processing includes the following steps: S2.1 First, analyze the straightness of the disconnector after closing. When the straightness after closing is lower than the predetermined value, the disconnector is directly classified as a high-risk level. S2.2 For disconnecting switches with straightness within the acceptable range, the real-time average ambient temperature T_emp is collected at regular intervals of time t. i Real-time average temperature of the contact point (Temp) i and real-time average temperature difference δT i ,δT i =Temp i -T_emp i , where i represents the i-th time period, i = 1, 2, 3...n; S2.3. Form a dataset from the corresponding real-time data, including the ambient temperature dataset T_emp. 集 Contact temperature dataset Temp 集 and mean temperature difference dataset δT 集 ; S2.4. Manually input the extreme value of the average temperature difference δT0, and then compare the extreme value of the average temperature difference δT0 with the real-time average temperature difference δT. i In contrast, when δT i When ≤δT0, the contact temperature is normal, and the disconnecting switch is classified as low-risk; when δT i When the temperature exceeds δT0, the temperature data is analyzed to further determine and correct the risk level of the disconnecting switch. S2.5, when δT i When the value is greater than δT0, the data within the dataset is analyzed, specifically the ambient temperature dataset T_emp. 集 One temperature fluctuation cycle, that is, the middle data between two peaks, and then find the corresponding contact temperature dataset Temp. 集 The temperature data within the corresponding time period is analyzed to determine the number of peaks M of the real-time average temperature of the contact within that time period, and the corresponding risk level is obtained through analysis. S2.6 When M≤2, the real-time average temperature fluctuation of the contacts is normal, and the disconnecting switch is judged to be at a medium-risk level; when M>2, the real-time average temperature fluctuation of the contacts is abnormal, and the disconnecting switch is judged to be at a high-risk level.

[0015] In one implementation, at a low-risk level, the corresponding action is to temporarily not take any action; at a medium-risk level, there is an abnormal increase in contact temperature, and if power outage maintenance is permitted, the operators need to grind the contacts of the first and second disconnect switches; at a high-risk level, the disconnect switch needs to be inspected immediately, and power outage maintenance is permitted. If power outage maintenance is not permitted, maintenance is carried out by establishing a bypass and short-circuiting while the circuit is energized.

[0016] In summary, the technical effects of this invention are: 1. By setting a new type of knife switch contact structure, it is ensured that after the first knife switch and the second knife switch are connected, the knife switch contact can realize the connection between the first knife switch and the second knife switch. At the same time, when the thrust spring on the contact body is mechanically jammed or fatigued, the clamping force of the contact body can be protected by the set thermal expansion liquid, so as to ensure the connection between the first knife switch and the second knife switch. 2. By setting up an automated troubleshooting method, when a fault occurs in the connection between the first and second disconnectors, the status and parameters of the first and second disconnectors can be judged to effectively and accurately locate the fault in the first and second disconnectors. At the same time, maintenance and risk assessment suggestions can be provided, and the maintenance and risk situation can be fed back to the maintenance personnel. This eliminates the need for regular inspections by maintenance personnel, reducing their workload and the error of human judgment. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the disconnector switch of the present invention; Figure 2 This is a schematic diagram of the second disconnector structure of the present invention; Figure 3 This is the invention Figure 2 Enlarged structural diagram of section A; Figure 4 This is a flowchart of the overall maintenance method of the present invention; Figure 5 This is a flowchart of the data judgment process of the present invention; In the diagram, 1-main frame, 2-electrical control cabinet, 3-insulator, 4-connecting shaft, 5-second knife switch, 6-first knife switch, 7-straightness measuring head, 8-thermal expansion liquid, 9-thrust spring, 10-contact body. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0020] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0021] See Figures 1-3 The present invention provides a disconnector switch maintenance device, characterized in that it comprises: A multimodal sensing unit is arranged on the disconnector switch to detect various parameters of the disconnector switch, including contact temperature, contact straightness, and ambient temperature signal. The multimodal sensing unit can include various temperature sensors and a straightness measuring head 7 for measuring straightness, thereby effectively detecting the state of the contacts, as well as the state of the first disconnector switch 6 and the second disconnector switch 5, thereby effectively detecting the straightness of the first disconnector switch 6 and the second disconnector switch 5, which facilitates the maintenance of the disconnector switch. Temperature control contact is set on the knife switch. The temperature control contact changes the pressure on the knife switch according to the temperature change. At the same time, by setting the temperature control contact, the first knife switch 6 and the second knife switch 5 are connected, so that the first knife switch 6 and the second knife switch 5 can form a closed circuit, thus forming a closed circuit of the disconnect switch. The control module collects parameters from the multimodal sensing unit and temperature contacts, processes the collected parameters, determines the status of the corresponding disconnect switch, and feeds the results back to maintenance personnel. By setting the control module, the status of various parameters can be detected, thus facilitating maintenance by operators.

[0022] In one embodiment, in order to achieve the closure between the first disconnect switch 6 and the second disconnect switch 5, the disconnect switch includes the first disconnect switch 6 and the second disconnect switch 5, the temperature control contact is disposed on the second disconnect switch 5, and the first disconnect switch 6 is inserted into the interior of the second disconnect switch 5 so that the temperature control contact and the first disconnect switch 6 fit together to form a closed circuit, thereby ensuring the normal power supply effect of the disconnect switch.

[0023] Specifically, in order to ensure a stable closed state, the second knife switch 5 is provided with a fitting sleeve, and the temperature control contact is installed inside the fitting sleeve. The inner wall of the fitting sleeve is provided with several mounting holes, and the temperature control contact is slidably connected inside the mounting holes.

[0024] In one exemplary embodiment, in order to enable the contact to change according to the temperature state, the temperature control contact includes: The contact body 10 is slidably connected to the inside of the mounting hole. The top of the contact body 10 is provided with a limiting flange to ensure that the temperature contact can contact the first knife switch 6. This ensures the normal contact and closed loop of the first knife switch 6 and guarantees the stability of the closure. A thrust spring 9 is located at the top of the contact body 10 to press the contact body 10 against the bottom of the mounting hole. A thermal expansion liquid 8 is filled between the top of the contact body 10 and the mounting hole. During use, the contact body 10 is pressed against the corresponding first knife switch 6 by the thrust spring 9, ensuring tight contact between the contact body 10 and the first knife switch 6 to form a closed circuit. The thermal expansion liquid 8 is also provided so that when the thrust spring 9 becomes fatigued or damaged, the heat generated by the contact body 10 can trigger the thermal expansion liquid 8. The thermal expansion liquid 8 then acts on the contact body 10, pressing it against the first knife switch 6 to maintain contact force and further complete the closing effect. Simultaneously, the thermal expansion liquid 8 changes state as the temperature of the contact body 10 changes.

[0025] Specifically, in order to detect the straightness between the first disconnector 6 and the second disconnector 5, a straightness measuring head 7 is provided on the first disconnector 6 and the second disconnector 5. After the first disconnector 6 and the second disconnector 5 are connected, the straightness of the first disconnector 6 and the second disconnector 5 is detected. Thus, when the straightness of the first disconnector 6 and the second disconnector 5 is abnormal, the disconnector can be directly repaired. The disconnector includes a main frame 1, and two insulators 3 are provided on the top of the main frame 1. The top of the insulators 3 is provided with conductive seats that cooperate with the disconnectors. The conductive seats are rotatably connected to the connecting shaft 4 on the top of the insulators, so as to effectively realize the function of the first disconnector and the second disconnector. The first disconnector 6 and the second disconnector 5 are respectively connected to the corresponding conductive seats to ensure the normal function and status of the disconnector. At the same time, an electrical control cabinet 2 is provided on the main frame 1 to facilitate the installation of various electrical components.

[0026] The present invention also provides a maintenance method, combined with Figure 4 This includes the following steps: S1. The contact temperature Temp and ambient temperature T_emp parameters are synchronously collected by the multimodal sensing unit deployed on the disconnecting switch to ensure that the status of the disconnecting switch can be judged in the future based on the temperature parameters. S2. The collected multidimensional parameters are transmitted to the control module for data processing, and then the processed data is compared and analyzed. S3. Based on the processed data and comparison, output the risk level of the disconnect switch and the handling method; S4. Based on the risk level and handling method of the disconnecting switch, automatically match the maintenance strategy and generate the maintenance strategy for the disconnecting switch; S5. Operators carry out maintenance according to the maintenance strategy. After the maintenance is completed, the maintenance effect is retested and closed-loop verification is performed through the multimodal sensing unit.

[0027] In one embodiment, see Figure 5 In step S2, data processing includes the following steps: S2.1 First, analyze the straightness of the disconnector after closing. When the straightness after closing is lower than the predetermined value, the disconnector is directly classified as a high-risk level. At this time, the first disconnector 6 and the second disconnector 5 have mechanical faults. The first disconnector 6 and the second disconnector 5 need to be adjusted and repaired to ensure the reliability of the first disconnector 6 and the second disconnector 5. For poor mechanical contact, ensure mechanical stability and reliability. S2.2 For disconnecting switches with straightness within the acceptable range, the real-time average ambient temperature T_emp is collected at regular intervals of time t. i Real-time average temperature of the contact point (Temp) i and real-time average temperature difference δTi ,δT i =Temp i -T_emp i , where i represents the i-th time period, i = 1, 2, 3...n; S2.3. Form a dataset from the corresponding real-time data, including the ambient temperature dataset T_emp. 集 Contact temperature dataset Temp 集 and mean temperature difference dataset δT 集 ; S2.4. Manually input the extreme value of the average temperature difference δT0, and then compare the extreme value of the average temperature difference δT0 with the real-time average temperature difference δT. i In contrast, when δT i When ≤δT0, the contact temperature is normal, and the disconnecting switch is classified as low-risk; when δT i When the temperature exceeds δT0, the temperature data is analyzed to further determine and correct the risk level of the disconnecting switch. S2.5, when δT i When the value is greater than δT0, the data within the dataset is analyzed, specifically the ambient temperature dataset T_emp. 集 One temperature fluctuation cycle, that is, the middle data between two peaks, and then find the corresponding contact temperature dataset Temp. 集 The temperature data within the corresponding time period is analyzed to determine the number of peaks M of the real-time average temperature of the contact within that time period, and the corresponding risk level is obtained through analysis. S2.6 When M≤2, the real-time average temperature fluctuation of the contacts is normal, and the disconnecting switch is judged to be at a medium-risk level; when M>2, the real-time average temperature fluctuation of the contacts is abnormal, and the disconnecting switch is judged to be at a high-risk level. As for setting the value of 2, under normal circumstances, there should be a maximum of two peaks between the two peaks of the ambient temperature. Because the temperature change may be delayed due to the lag of the temperature change, the number of peaks may change. Therefore, the value of M can be set to 2.

[0028] In one embodiment, to ensure that operators can be reminded of the corresponding risk level's handling measures, at a low risk level, the corresponding handling opinion is that no action is needed for the time being; at a medium risk level, when there is an abnormal increase in contact temperature, if power outage maintenance is permitted, the operator needs to polish the contacts of the first barrier switch and the second disconnect switch 5; at a high risk level, the disconnect switch needs to be inspected immediately, and power outage maintenance is permitted. If power outage maintenance is not permitted, maintenance is carried out by establishing a bypass and short-circuiting while the circuit is energized.

[0029] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A device for overhauling disconnect switches, characterized in that, include: A multimodal sensing unit is arranged on the disconnector switch to detect various parameters of the disconnector switch, including contact temperature, contact straightness and ambient temperature signal. A temperature control contact is disposed on the knife switch, and the pressure exerted by the temperature control contact on the knife switch changes accordingly with the temperature change; The control module collects parameters from the multimodal sensing unit and temperature contacts, processes the collected parameters, determines the status of the corresponding disconnect switch, and feeds back the results to maintenance personnel.

2. The disconnector switch maintenance device according to claim 1, characterized in that, The disconnect switch includes a first disconnect switch and a second disconnect switch. The temperature control contact is disposed on the second disconnect switch, and the first disconnect switch is inserted inside the second disconnect switch so that the temperature control contact is fitted with the first disconnect switch to form a closed circuit.

3. The disconnector switch maintenance device according to claim 2, characterized in that, The second knife switch is provided with a fitting sleeve, and the temperature control contact is installed inside the fitting sleeve. The inner wall of the fitting sleeve is provided with several mounting holes, and the temperature control contact is slidably connected to the inside of the mounting holes.

4. The disconnector switch maintenance device according to claim 3, characterized in that, The temperature control contact includes: The contact body is slidably connected to the interior of the mounting hole, and a limiting flange is provided on the top of the contact body; A thrust spring is disposed on the top of the contact body to press the contact body against the bottom of the mounting hole, and a thermally expanding liquid is filled between the top of the contact body and the mounting hole.

5. The disconnector switch maintenance device according to claim 2, characterized in that, The first and second disconnect switches are equipped with straightness measuring heads, which detect the straightness of the first and second disconnect switches after they are connected.

6. The disconnector switch maintenance device according to claim 4, characterized in that, The disconnect switch includes a main frame, and two insulators are provided on the top of the main frame. The top of the insulators is provided with conductive bases that cooperate with the disconnect switches. The first disconnect switch and the second disconnect switch are respectively connected to the corresponding conductive bases.

7. A maintenance method, based on the disconnector switch maintenance device according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1. The contact temperature Temp and ambient temperature T_emp parameters are synchronously collected by the multimodal sensing unit deployed on the disconnecting switch; S2. The collected multidimensional parameters are transmitted to the control module for data processing, and then the processed data is compared and analyzed. S3. Based on the processed data and comparison, output the risk level of the disconnect switch and the handling method; S4. Based on the risk level and handling method of the disconnecting switch, automatically match the maintenance strategy and generate the maintenance strategy for the disconnecting switch; S5. Operators carry out maintenance according to the maintenance strategy. After the maintenance is completed, the maintenance effect is retested and closed-loop verification is performed through the multimodal sensing unit.

8. The maintenance method according to claim 7, characterized in that, In step S2, data processing includes the following steps: S2.1 First, analyze the straightness of the disconnector after closing. When the straightness after closing is lower than the predetermined value, the disconnector is directly classified as a high-risk level. S2.2 For disconnecting switches with straightness within the acceptable range, the real-time average ambient temperature T_emp is collected at regular intervals of time t. i Real-time average temperature of the contact point (Temp) i and real-time average temperature difference δT i δT i =Temp i -T_emp i , where i represents the i-th time period, i = 1, 2, 3...n; S2.

3. Form a dataset from the corresponding real-time data, including the ambient temperature dataset T_emp. 集 Contact temperature dataset Temp 集 and mean temperature difference dataset δT 集 ; S2.

4. Manually input the extreme value of the average temperature difference δT0, and then compare the extreme value of the average temperature difference δT0 with the real-time average temperature difference δT. i In contrast, when δT i When ≤δT0, the contact temperature is normal, and the disconnecting switch is classified as low-risk; when δT i When the temperature exceeds δT0, the temperature data is analyzed to further determine and correct the risk level of the disconnecting switch. S2.5, when δT i When the value is greater than δT0, the data within the dataset is analyzed, specifically the ambient temperature dataset T_emp. 集 One temperature fluctuation cycle, that is, the middle data between two peaks, and then find the corresponding contact temperature dataset Temp. 集 The temperature data within the corresponding time period is analyzed to determine the number of peaks M of the real-time average temperature of the contact within that time period, and the corresponding risk level is obtained through analysis. S2.6 When M≤2, the real-time average temperature fluctuation of the contacts is normal, and the disconnecting switch is judged to be at a medium-risk level; when M>2, the real-time average temperature fluctuation of the contacts is abnormal, and the disconnecting switch is judged to be at a high-risk level.

9. The maintenance method according to claim 8, characterized in that, At low risk levels, the recommended course of action is to temporarily remove the switch. At medium risk levels, where there is an abnormal increase in contact temperature, if power outage maintenance is permitted, operators should grind the contacts of the first and second disconnect switches. At high risk levels, the disconnect switch needs immediate maintenance. Power outage maintenance is permissible; if power outage maintenance is not permitted, maintenance should be carried out by establishing a bypass and short-circuiting the switch while it is energized.

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